Command PRO gaseous fuel engines are designed to run on either gasoline, natural gas or propane. This professional line of carbureted propane and natural gas engines eliminates bad gasoline issues and lets you skip fuel-system winterization. The KOHLER PRO9.0E Tri Fuel Generator 7200/9000 watts is a great choice for a homeowner looking to power up a couple window air conditioners, heat, microwave, lights, entertainment center, computers, refrigerators, etc.